Standard documents sought for ISDN

[Ghazan Haider]

I am trying to learn DSP development by trying to build an ISDN TA (or
even a POTS interface) using DSP chips. So far my troubles are finding
the right documentation with the specification of ISDN line
modulation, protol, and POTS line modulation for V.32.

Where can I find these specs? Are they specified in IEEE, ISO, or does
the FTC specify them? Do I have to fork out $$$ for specs that are
internationally used?

 

[Rich Grise]

I am trying to learn DSP development by trying to build an ISDN TA (or
even a POTS interface) using DSP chips. So far my troubles are finding
the right documentation with the specification of ISDN line
modulation, protol, and POTS line modulation for V.32.

Where can I find these specs? Are they specified in IEEE, ISO, or does
the FTC specify them? Do I have to fork out $$$ for specs that are
internationally used?

Call your local phone company and ask to talk to "vertical engineering."
They have all those answers.

Good Luck!
Rich

 

[Dbowey]

ghazan posted:

I am trying to learn DSP development by trying to build an ISDN TA (or
even a POTS interface) using DSP chips. So far my troubles are finding
the right documentation with the specification of ISDN line
modulation, protol, and POTS line modulation for V.32.

ANSI makes their money by selling the Standards. However, Documents "in the
works" can sometimes be had for free. Are you after the ISDN Basic Rate
Network Interface line code and protocols, or are looking for the exchange
between a TA and NT2, or is the NT2 in your TA, or ?? I will check out my
usual haunts to see what's available for free. Do you work in the industry?
If so, what is your company? With that I might get you more goodies. If you
don't wish to post it here, pls email me direct.

Don

 

[Nico Coesel]

I am trying to learn DSP development by trying to build an ISDN TA (or
even a POTS interface) using DSP chips. So far my troubles are finding
the right documentation with the specification of ISDN line
modulation, protol, and POTS line modulation for V.32.

Where can I find these specs? Are they specified in IEEE, ISO, or does
the FTC specify them? Do I have to fork out $$$ for specs that are
internationally used?

Search for I.430, Q.920, Q.921, Q.930, Q.931. With some Googl'ing
you'll find these specs in pdf format. From these documents you can
build an ISDN TA, but it will take more than a few months.
You should start with POTS because this is much easier. You can buy
modules from Zarlink (formerly know as Mitel) which do al the
isolation and splitting for you.

 

[Don Pearce]

I am trying to learn DSP development by trying to build an ISDN TA (or
even a POTS interface) using DSP chips. So far my troubles are finding
the right documentation with the specification of ISDN line
modulation, protol, and POTS line modulation for V.32.

Where can I find these specs? Are they specified in IEEE, ISO, or does
the FTC specify them? Do I have to fork out $$$ for specs that are
internationally used?

Go to http://www.etsi.org/ and do a search. You will find plenty of
ISDN standards. Better yet they are free provided you don't want too
many per day.

d
Pearce Consulting
http://www.pearce.uk.com

 

[Ghazan Haider]

Thanks everyone for the answers, they helped.

usual haunts to see what's available for free. Do you work in the industry?
If so, what is your company? With that I might get you more goodies. If you

Not really. Just a student getting a little confident.